It is customary for Qt types that can be constructed from string-ish
to provide a fromString() named constructor. QColor didn't, relying
instead on a set of overloaded implicit and explicit constructors.
Add the named constructor, with the intent to deprecate the string-ish
QColor constructors after a grace period.
To prevent new users from using known-to-become-deprecated API, mark
the old functions as \obsolete.
Also rename isValidColor() to isValidColorName(). The only reason why
these are lumped together in single commit is so that their docs can
refer to each other instead of having to temporarily refer to obsolete
API.
[ChangeLog][QtGui][QColor] Added fromString() and isValidColorName(),
both taking QAnyStringView.
Task-number: QTBUG-101389
Change-Id: I2857c728257ad2f14c7c968b45547bdf07c44b63
Reviewed-by: Allan Sandfeld Jensen <allan.jensen@qt.io>
Reviewed-by: Qt CI Bot <qt_ci_bot@qt-project.org>
78b6876974